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microflow policing details

I'm curious if anyone could share their experiences with the microflow policing feature.  I'm interested in the following, which I haven't been able to find searching documentation:

1. How many concurrent flows can be policed?  It would seem this is "just over 128,000 flows".  Has anyone stressed this?

2. What is the system behavior when the number of active flows excees the 128K limit?  Are new flows simply not policed?

3. Are the Catalysts the only platforms with this feature?  Feature Navigator doesn't seem to be current (doesn't list 6500).  I'm curious if there are plans for this feature in the ASR

4. Can UBRL be used to get greater scale our of this feature?  I suspect users (source IPs) with many flows will eat away at the 128K flow limit.  Can UBRL be used to scale this to 128K source IPs?

Thanks in advance!

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